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European Commission President Jean-Claude Juncker, right, greets UK Independent Party leader Nigel Farage during a special session of European Parliament in Brussels on Tuesday. EU heads of state and government are meeting Tuesday and Wednesday in Brussels for the first time since Britain voted to leave the European Union. Associated Press

European Commission President Jean-Claude Juncker, right, greets UKIP leader Nigel Farage during a special session of European Parliament in Brussels on Tuesday, June 28, 2016. EU heads of state and government meet Tuesday and Wednesday in Brussels for the first time since Britain voted to leave the European Union, throwing British and European politics into disarray. (AP Photo/Geert Vanden Wijngaert)